That’s the only copy I have of it. It opens and works without issue for me in Office 2013 (although I do have to click the box to enable editing – as is the default in this version of Office for files downloaded from the internet).

Unfortunately that doesn’t appear possible. I’ve just tried saving the current version in Excel 97-2003 format but there are functions that are not available in versions prior to Excel 2007.

However, all is not lost. Microsoft have released a Compatibility Pack that apparently lets you “open, edit, and save documents, workbooks, and presentations that were created in the newer versions of Word, Excel, and PowerPoint.”

If you are willing to try it please let me know if it works for you and I’ll update the original entry.